FYI: acpi | boot hangs when Laptop not connected to AC | NEC Versa FM320
Matthew Dillon
dillon at apollo.backplane.com
Mon Aug 2 12:54:43 PDT 2004
Ok, the problem with boot hangs when AC is not connected to a laptop
should now be fixed in the source tree.
The problem turned out to be an early interrupt from ACPI caused ACPI
to try to call tsleep() with a timeout in the SWI task code before
the system clocks had been initialized, resulting in an infinite timeout.
The original code misused SWI's terribly and the code FreeBSD-5 is using
was not much better, so I rewrote the callback subsystem.
-Matt
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